Sirius: I have a transfiguration question.
McGonagall: It's ten at night on Saturday.
Sirius: Do you know anything about transfiguring animal parts back to human parts? Specifically, antlers?
McGonagall: Antlers? What is this for?
Sirius: ...Fun.
McGonagall: Okay. Well, why don't we talk about it Monday after class?
Sirius: You always say we should never stop being curious. To always open any curiosity door we find. Why are you keeping this curiosity door locked?